Safe Haskell	None
Language	Haskell2010

Control.Carrier.Trace.Printing

Contents

Trace carrier
Trace effect

Description

A carrier for the Trace effect that prints all traced results to stderr.

Since: 1.0.0.0

Synopsis

runTrace :: TraceC m a -> m a
newtype TraceC m a = TraceC (m a)
module Control.Effect.Trace

Trace carrier

runTrace :: TraceC m a -> m a Source #

Run a Trace effect, printing traces to stderr.

runTrace (trace s) = liftIO (putStrLn s)

runTrace (pure a) = pure a

Since: 1.0.0.0

newtype TraceC m a Source #

Since: 1.0.0.0

Constructors

TraceC (m a)

Instances

MonadTrans TraceC Source #
Instance details Defined in Control.Carrier.Trace.Printing Methods lift :: Monad m => m a -> TraceC m a #
Monad m => Monad (TraceC m) Source #
Instance details Defined in Control.Carrier.Trace.Printing Methods (>>=) :: TraceC m a -> (a -> TraceC m b) -> TraceC m b # (>>) :: TraceC m a -> TraceC m b -> TraceC m b # return :: a -> TraceC m a # fail :: String -> TraceC m a #
Functor m => Functor (TraceC m) Source #
Instance details Defined in Control.Carrier.Trace.Printing Methods fmap :: (a -> b) -> TraceC m a -> TraceC m b # (<$) :: a -> TraceC m b -> TraceC m a #
MonadFix m => MonadFix (TraceC m) Source #
Instance details Defined in Control.Carrier.Trace.Printing Methods mfix :: (a -> TraceC m a) -> TraceC m a #
MonadFail m => MonadFail (TraceC m) Source #
Instance details Defined in Control.Carrier.Trace.Printing Methods fail :: String -> TraceC m a #
Applicative m => Applicative (TraceC m) Source #
Instance details Defined in Control.Carrier.Trace.Printing Methods pure :: a -> TraceC m a # (<>) :: TraceC m (a -> b) -> TraceC m a -> TraceC m b # liftA2 :: (a -> b -> c) -> TraceC m a -> TraceC m b -> TraceC m c # (>) :: TraceC m a -> TraceC m b -> TraceC m b # (<*) :: TraceC m a -> TraceC m b -> TraceC m a #
MonadIO m => MonadIO (TraceC m) Source #
Instance details Defined in Control.Carrier.Trace.Printing Methods liftIO :: IO a -> TraceC m a #
Alternative m => Alternative (TraceC m) Source #
Instance details Defined in Control.Carrier.Trace.Printing Methods empty :: TraceC m a # (<\|>) :: TraceC m a -> TraceC m a -> TraceC m a # some :: TraceC m a -> TraceC m [a] # many :: TraceC m a -> TraceC m [a] #
MonadPlus m => MonadPlus (TraceC m) Source #
Instance details Defined in Control.Carrier.Trace.Printing Methods mzero :: TraceC m a # mplus :: TraceC m a -> TraceC m a -> TraceC m a #
(MonadIO m, Algebra sig m) => Algebra (Trace :+: sig) (TraceC m) Source #
Instance details Defined in Control.Carrier.Trace.Printing Methods alg :: Functor ctx => Handler ctx n (TraceC m) -> (Trace :+: sig) n a -> ctx () -> TraceC m (ctx a) Source #

Trace effect

module Control.Effect.Trace